The hand crank table's height can be adjusted through the manual screw jack. The hand crank screw jacks mechanism usually includes cast iron crank,screw jack mechanism,connecting shaft,flexible couplings and pillow block.

Pillow block

Connecting shaft

Couplings

Handwheel

With the crank table loading capacity,lifting height,distance between screw jacks, we can give customers whole solution.When loading capacity is big, the guide support will be suggested. Because screw jacks are designed primarily to raise and lower axial loads and any side loads should be avoided. The jacks will withstand some side loads, depending on the diameter of the lifting screw and the extended length of the lifting screw. For most of table sizes is not small, when put the loads on the table, the loads is not uniform on the lifting screw, where side loads are present, the loads should be guided and the guides, rather than the screw jacks, should take the side loads -particularly when long raises are involved. Even a small side load on the table, which can exert great force on the screw jacks housings and bearings and increase the operating torque and reduce the life expectancy.

When distance between two jacks is far, the pillow block will be suggested, because the long connecting shaft is easy to get bent during long time use.

Let's take a look at the manual acme screw lift application scenario for industrial crank table and dinning table.